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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b962f0398703116ccf4e0d61ff81caeee9bedf7835dccf7469b074cdfbc414a1' 
  AND token = 'CK/cJ7e6IPGx2BSR8C3Z+uMFZVG78T03hEPcJfeUL5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}